A new species of the Amynthas corticis group with support from mitogenomic data and a new record of Metaphire agrestis (Goto & Hatai, 1899) (Oligochaeta, Megascolecidae) in northeastern China Author Han, Anne Charis N. https://orcid.org/0009-0000-7312-4985 Hebei Key Laboratory of Animal Diversity, College of Life Science, Langfang Normal University, Langfang 065000, China & State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun 130117, China Author Zhao, Nannan https://orcid.org/0009-0005-4694-3121 Hebei Key Laboratory of Animal Diversity, College of Life Science, Langfang Normal University, Langfang 065000, China Author Aspe, Nonillon M. 0000-0003-0025-6017 College of Environment and Life Sciences, Mindanao State University at Naawan, Misamis Oriental, Naawan 9023, Philippines Author Nob, Christian Jay R. 0000-0003-2463-6698 State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun 130117, China Author Zhang, Yufeng 0000-0002-4066-6355 Hebei Key Laboratory of Animal Diversity, College of Life Science, Langfang Normal University, Langfang 065000, China Author Wu, Donghui 0000-0001-8778-0107 State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun 130117, China & Key Laboratory of Wetland Ecology and Environment, State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China Author Zhao, Huifeng 0000-0003-4243-9671 Hebei Key Laboratory of Animal Diversity, College of Life Science, Langfang Normal University, Langfang 065000, China & Key Laboratory of Wetland Ecology and Environment, State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China text ZooKeys 2026 2026-01-12 1266 231 261 journal article 313703 10.3897/zookeys.1266.161903 7f572354-0167-4afa-a8ee-1c0d01077429 3A9374B8-02B0-4BFC-BF13-CA86BC51B6C4

Table 3. Summary comparison between Amynthas dandongensis sp. nov. from China and A. sangumburi from Korea.

Descriptions	A. dandongensis sp. nov.	A. sangumburi
No. of specimens	14	5
Length	41–57	46–68
Width	1.0 – 2.5	2.3–2.5
Color	dorsum brown to yellowish brown, while ventrum part is pale yellow	dorsum pale brown
Segment No.	86–104	58–79
1 st dorsal pore	12 / 13	12 / 13
Setae	32–35 (V), 40–45 (XIII), 48–52 (XX)	39 (VII), 43 (XX); 3–4 between male pores
Spermathecal pores	5 / 6–8 / 9, medio-lateral, nearly inconspicuous with 0.20–0.22 C apart ventrally	5 / 6–8 / 9, lateral, very small
Male pores	absent	centered on 0.8 mm circular flat porophores extending to lateral margins of ventrum in XVIII
Genital markings	absent	absent
Septa	Septa 5 / 6 / 7 slightly thickened, 7 / 8 thin, 8 / 9 / 10 absent, 10 / 11 / 12 / 13 / 14 thin	5 / 6, 6 / 7 thick, 7 / 8 some muscle, 8 / 9 absent; 9 / 10 if present is part of testis sac X, 10 / 11–13 / 14 thin
Spermathecae	four pairs in VI – IX ampulla oval; ampulla duct thick and stout, abruptly narrower towards ectal end (1.3–1.8 mm long); diverticulum with slender and long duct and ovoid receptacle (1.5–2.0 mm long); receptacle 1 / 3 length as with the diverticulum duct	four pairs of spermathecae in VI – IX; ampulla cylindrical (VI, VII) to sagittate or ovate; ducts short, not muscular, diverticuum stalked, gradually widening distally
Gizzard	VIII – X	VIII – X
Seminal vesicles	two pairs in XI and XII	two pairs in XI, XII
Testis	paired in X, XI	paired in X, XI
Intestinal origin	XV	XV
Prostate glands	absent	in XVIII, large within XVII – XX; thick ducts of median length, nearly straight, both glandular portions consist of 2 or 3 main lobes, each lobe divided into leaflets
Intestinal caeca	simple, in XXVII and extending anterior to XXI	simple, in XXVI / XXVII, and extending anterior to ~ XXIII / XXIV
Accessory glands	absent	absent